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Mathematics 13 Online
OpenStudy (anonymous):

You are buying gifts for 10 people. You decide to buy each person either a CD or a DVD. A CD costs $12 and a DVD costs $20. a. Let c=the number of CDs you decide to buy. What is an expression in terms of c for the number of DVDs you buy? b. What is an expression in terms of c for the cost of the CDs? For the cost of the DVDs? c. Write and simplify an expression in terms of c for the total cost of all the gifts you buy. What properties of real numbers did you use to simplify the expression.

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